如图pa是圆o的切线切点为a若op=4pa=2根3求sin

什么是寡聚体? 胰岛素 寡聚蛋白胰岛素 是寡聚蛋白吗,虽然是由AB两链组成的,但是又是又一条链经过切割所得来的,到底怎么判断 怎样识别定冠词与不定冠词,an/a/the的基本用法 some,any,no,much,many,a lot of接可数,不可数名词的用法 many/how many /some 等词后面的名词,为什么有时加of而有时没有? 在下列名词前加上a,an,some____money _____hours ____university ____sugar _____knives ____room ___bag _____milk _____piece of cheese _____sonw ______apple ____pair of shoes ___letter ____piece of paper____university到底是填a还是an？ 在英语句子中 有的名词不加the a an many some. 那么这些词为什么不加 什么情况下不加 When is Mid-autumn Day?我要的是答语，不是翻译 爱默生是哪国的什么学家 angry ；green；dangerous的比较级 一.按要求做题（例题要做） 例：1.angry比较级2.sad比较级3.bored同音词4.sick同义词5.pass三单形式6.john名词所有格 not gold at all ···· 翻译 但是抽象名词有时也可以加The 或A An 到底怎么用啊,具体啊 think of 后用V－ING? think 后可直接加ing形式的词吗 请翻译：“我认为做饭很好.” you still care,don’www.hao882.com t ever let me know.大家急速帮我翻译下 朋友的发给我的! Not at all是一个否定表达 英语翻译 not at all的翻译 not at all 该怎么翻译呢? I am beautiful 是什么时态?一个年老的教师正在给学生上英语课,她指着一句英文短语问:"同学们.I am beautiful ,是什么时态?＂ 全班同学齐声回答什么时? I am beautiful 变否定和疑问 I am beautiful within! 翻译 I am beautiful truth the problem of .is becoming more ang more serious today .这里面是用serious还是seriously?我认为是副词,因为become是动词,用了现在进行时的时态,修饰动词用副词 sure和of course在实际运用有什么区别 You don't see my tears,but still,I love more of a problem think of you 是 想你 的意思?怎么还有动词加of的 think of的意思是想吗? Ashamed of having acted so rashly, Dimitri apologized to Aleko for having accused him.此句中应该是being ashamed of,为什么可以省略being?（简短易懂些）thank you~ Ashamed of having acted rashly,he apologized to Jack.请问这里本来是 He was ashamed that he had acted rashly .So he apologized to Jack.那个having 来自于过去完成时态的的 had,对不.-_-! Ashamed of having acted so rashly.这里的having是什么用法 I consider him___ disgracefully.A.to act B.acting C.to have acted D.having acted Which is right?I don't know what to choose.________,he's only been learning English for a year,he speaks it very well.A.Considered B.Considering C.Having considered D.To